Fill dutch oven half full of water and bring to a boil over coals at about 300 degree heat.Add macaroni and boil for 10 minutes.Strain macaroni into a bowl and discard the water.Chop onion and measure 3/4 cup.Chop pepper and measure 3/4 cup.Heat dutch oven over coals to about 375 degrees for Frying.Brown and break apart the ground beef for 5 minutes.Add onion and pepper.Cook and mix until ground beef is done, about another 5 minutes.Stir in taco seasoning and water.Cook and mix for another 3 to 5 minutes.Do not drain the beans, corn, and tomatoes. If you do drain them, then add another 1/4 cup of water.Stir beans, corn, tomatoes, macaroni, 8 ounces of cheese, and salt into meat.Cover with dutch oven lid, move heat to lid, and Bake at about 350 degrees for about 20 minutes.Sprinkle 2 ounces of cheese on the casserole and bake 10 minutes longer.Serves 6 to 8.